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karthiksudhir
Joined: 20 May 2010 Posts: 15
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Posted: Sat Jun 05, 2010 10:57 am Post subject: Adapter Trouble for Helios-44 |
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karthiksudhir wrote:
So i recently purchased a Helios-44 lens. I thought it was a helios 44-2 lens and bought from ebay a m42 to eos adapter, but when i got the lens found out that the adapter is too big for the lens.
After a lot of reading on this forum and the pentax forum i think i might have a few things clear(er) now (correct me if i am wrong)
1. the logo on the image suggests its MMZ
2. it has white letters and has N60xxx... numbering suggests it was made in 196X
3. its NOT Helios 44-2 its a Helios-44 MMZ
My biggest question is since the m42 adapter(screw) does not fit do i need a m39 to eos adapter.
I am unable to figure out if i can use this on a canon dslr if yes what adapter would you recommend i use ?
thanks in advance
below some screenshots.
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karthiksudhir
Joined: 20 May 2010 Posts: 15
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M. Valdemar
Joined: 14 Nov 2008 Posts: 93
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Posted: Sat Jun 05, 2010 11:29 am Post subject: |
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M. Valdemar wrote:
(I deleted this post because my information was inaccurate)
Last edited by M. Valdemar on Sat Jun 05, 2010 11:58 am; edited 1 time in total |
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karthiksudhir
Joined: 20 May 2010 Posts: 15
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Posted: Sat Jun 05, 2010 11:32 am Post subject: |
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karthiksudhir wrote:
Yes the threading on the lens is smaller for the m42 adapter.
Could you please elaborate on the focus to film plane being different ?
would it be better if i were to use
m39-m42 & m42-eos instead of
m39-eos
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peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
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Posted: Sat Jun 05, 2010 11:49 am Post subject: |
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peterqd wrote:
M. Valdemar wrote: |
Is the lens thread too small for the M42 Pentax adapter?
In that case you have a Leica M39 thread and it will not easily work with a Canon DSLR. The focus to film plane is different. |
No, sorry, this is misinformation. The Helios-44 has M39 X 1mm thread, not Leica M39x26tpi. It was designed for the Zenit M39 cameras with virtually the same register distance as M42 so it will work fine on your camera if you get a M39>M42 ring to use with your M42 adapter. _________________ Peter - Moderator |
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no-X
Joined: 19 Jul 2008 Posts: 2495 Location: Budejky, Czech Republic
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Posted: Sat Jun 05, 2010 11:56 am Post subject: |
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no-X wrote:
karthiksudhir: I think your lens is early copy of zebra Helios 44 model... according to the "N60xxx" I'd say it's 1966. But it's also possible, that the ring is older than the other parts of the lens (maybe they used old stocks at MMZ).
Try a simple test. Mount the EOS-M42 adapter on your DSLR, set the lens at infinity and hold it by your hand directly on the adapter. Try to take a few pictures of the horizon. Check the pictures - if the horizon is in focus, you don't need special adapter and M39-M42 ring will be enough. If the horizon isn't sharp, the lens with the EOS-M42 probably doesn't hit infinity, so special (thinner) adapter will be needed. _________________ (almost) complete list of Helios lenses |
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M. Valdemar
Joined: 14 Nov 2008 Posts: 93
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Posted: Sat Jun 05, 2010 11:57 am Post subject: |
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M. Valdemar wrote:
peterqd is correct. I forgot that this lens has same register distance as M42. |
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sichko
Joined: 20 Jun 2008 Posts: 2475 Location: South West UK
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Posted: Sat Jun 05, 2010 12:01 pm Post subject: |
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sichko wrote:
peterqd wrote: |
M. Valdemar wrote: |
Is the lens thread too small for the M42 Pentax adapter?
In that case you have a Leica M39 thread and it will not easily work with a Canon DSLR. The focus to film plane is different. |
No, sorry, this is misinformation. The Helios-44 has M39 X 1mm thread, not Leica M39x26tpi. It was designed for the Zenit M39 cameras with virtually the same register distance as M42 so it will work fine on your camera if you get a M39>M42 ring to use with your M42 adapter. |
Using this approach infinity focus will be at ~ 10 m. _________________ John |
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karthiksudhir
Joined: 20 May 2010 Posts: 15
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Posted: Sat Jun 05, 2010 12:04 pm Post subject: |
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karthiksudhir wrote:
thanks Valdemar and peterqd this info really helps
this is what i found on another forum
http://www.rangefinderforum.com/forums/showthread.php?t=9056
M42 screw M42x1 thread 45.46
Zenith 3M M39x1 thread 45.46
Leica screw M39x26tpi 28.80
The Leica lenses are commonly referred to as 'LTM' and the Zenith lenses are commonly referred to as 'M39'. As you can see, the distance from the back of the lens flange to the film plane is VERY different. With an M39 to M42 adapter, you can mount any M39 lens on an M42 body and expect to get infinity focus. As others here have said - that won't work for a Leica lens.
thanks no-x
that was a great tip, i just tried it out. set aperture to 16 and then took a test shot and the horizon did not look that fuzzy.
Would it be possible to post a link to the "special" adapter please.
Thanks!! |
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karthiksudhir
Joined: 20 May 2010 Posts: 15
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Posted: Sat Jun 05, 2010 12:05 pm Post subject: |
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karthiksudhir wrote:
sichko wrote: |
peterqd wrote: |
M. Valdemar wrote: |
Is the lens thread too small for the M42 Pentax adapter?
In that case you have a Leica M39 thread and it will not easily work with a Canon DSLR. The focus to film plane is different. |
No, sorry, this is misinformation. The Helios-44 has M39 X 1mm thread, not Leica M39x26tpi. It was designed for the Zenit M39 cameras with virtually the same register distance as M42 so it will work fine on your camera if you get a M39>M42 ring to use with your M42 adapter. |
Using this approach infinity focus will be at ~ 10 m. |
can you elaborate on this .....
because in the photo that i shot i see some buildings about 5-6 blocks away pretty sharp, i was suprised |
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sichko
Joined: 20 Jun 2008 Posts: 2475 Location: South West UK
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Posted: Sat Jun 05, 2010 12:48 pm Post subject: |
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sichko wrote:
karthiksudhir wrote: |
sichko wrote: |
peterqd wrote: |
M. Valdemar wrote: |
Is the lens thread too small for the M42 Pentax adapter?
In that case you have a Leica M39 thread and it will not easily work with a Canon DSLR. The focus to film plane is different. |
No, sorry, this is misinformation. The Helios-44 has M39 X 1mm thread, not Leica M39x26tpi. It was designed for the Zenit M39 cameras with virtually the same register distance as M42 so it will work fine on your camera if you get a M39>M42 ring to use with your M42 adapter. |
Using this approach infinity focus will be at ~ 10 m. |
can you elaborate on this .....
because in the photo that i shot i see some buildings about 5-6 blocks away pretty sharp, i was suprised |
The normal register length (working distance) for a Zenit M39 lens is 45.2 mm. The normal register for a Zenit M42 lens is 45.5 mm. These are the numbers quoted in the Zenit archive ...
http://zenit.istra.ru/archive/lenses/helios-44.html
and quoted by Zenit in their instruction manuals.
(Note that for a time the Zenit E camera [and possibly the Zenit B] was [were] made with both M42 and M39 mounts and there are examples of M42 lenses with the shorter register and of M39 lenses with the longer register)
If you convert a short register M39 lens to an "M42" lens using an M39-M42 ring and use it on a camera designed for a long register lens you are effectively using the lens with a short (0.3 mm) extension tube. Using the simple lens approximation ...
1/f = 1/S1 + 1/S2
where f = focal length of the lens, S1 = lens-film/sensor distance and S2 = lens subject distance puts "infinity" at 11.3 m for f= 58 mm. _________________ John |
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